Drainage channel



FIG. 1 is a perspective view taken from the top, front and right side of a drainage channel showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a right side elevational view thereof, the left side being a mirror image of the right shoe shown;

FIG. 4 is a front elevational view thereof; and

FIG. 5 is a rear end elevational view thereof. 

The ornamental design for the drainage channel, as shown and described. 